Ancient Mars.jpeg

Mars as it may have looked like billions of years ago: Vast plumes of ash and water vapor billow into the atmosphere from the Tharsis region , a massive bulge of volcanic activity that created the tallest mountains in the solar system. Meanwhile, an icy r (on the right) Mars as it may have looked like billions of years ago: Vast plumes of ash and water vapor billow into the atmosphere from the Tharsis region , a massive bulge of volcanic activity that created the tallest mountains in the solar system. Meanwhile, an icy ring of precipitation carves out valleys and canyons around a ring just south of the Martian equator.